Google Chrome

Click on the "Tools" menu and select "Clear Browsing Data...".
Select "Clear cookies and other site data" to clear all cookies from the list (alternatively, you can remove all cookies created within a specific time period by selecting the period you want from the dropdown list).
Select "Clear browsing data" to clear traces of which websites you've visited.
Select "Clear download history" to clear records of which files and programs you've downloaded.
Select "Empty the cache" to clear cached website pages.
You can also clear saved passwords (which log you into websites) and saved form data (such as your name and address).
Then click on the "Clear browsing data" button.
Click on the Close button when you've finished.

Internet Explorer 9

Open Internet explorer window
Click the “Tools” button
Point to “safety” and then click “clear browsing history”
Tick the “cookies” box, then click “clear”

Internet Explorer 8

Click "Safety" on the Command bar
Select "Delete Browsing History"
Select the option for cookies and click Delete

Alternatively, Internet Explorer 8's new InPrivate browsing feature allows users to browse the internet without recording information from visited sites (including cookies). To use InPrivate mode:

Click "Safety" on the Command bar
Select "InPrivate Browsing"

Internet Explorer 7.x

Exit Internet Explorer 7, and then exit any instances of Windows Explorer
Click Start, click Run, type inetcpl.cpl, and then press ENTER
On the General tab, click Delete under Browsing History in the Internet Properties dialog box
In the Delete Browsing History dialog box, click Delete Cookies
In the Delete Cookies dialog box, click Yes.

Internet Explorer (all other versions)

Internet Explorer saves cookies in more than one location, depending on the version of the browser and the version of Microsoft Windows being used.

The best way to find and clear them is to close Internet Explorer then use your file management software (such as Windows Explorer) and search for a folder called 'cookies'.

AOL 8 and 9

Sign on and select Settings from the toolbar.
Version 9.0 users should select the By Category tab and click the Internet [Web] Options link, while for Version 8.0 and below click Internet Properties (WWW).
Click Settings.
Note: Windows Vista will see more than one Settings button. Click the button in the Browsing history section.
Click View Files. Your list of cookies (plus your other temporary internet files) will be displayed.
If you wish to clear any of the cookies or files, right-click on them and choose Delete.

Mozilla

Choose Cookie Manager from the Tools menu.
Choose Manage Stored Cookies.
Remove any cookie from the list, or remove all cookies.

Mozilla Firefox

Click on Tools, then Options (or Edit | Preferences on Linux)
Select Privacy
In the Cookies panel, click on Show Cookies
To remove a single cookie click on the entry in the list and click on the Remove Cookie button
To remove all cookies click on the Remove All Cookies button

Netscape Navigator 7.x

Choose Cookie Manager from the Tools menu.
Choose Manage Stored Cookies.
Remove any cookie from the list, or remove all cookies.

Netscape Navigator 6.x

Choose Cookie Manager from the Tools menu.
Choose Manage Stored Cookies.
Remove any cookie from the list, or remove all cookies.

Netscape Navigator 4.x

In Netscape, all cookies are stored into one file, called Cookies.txt, in the user preferences folder, making them easy to find and clear. The folder can be located by using your file management software to search your hard disk drive for "cookies.txt".

Users of Netscape Navigator 4.x may also stop cookies from being written to the hard drive, by making the cookies file read only. However, even if the browser can't "write" cookies to the hard drive, it can still cache them, and it may create a new cookie file.

Opera

To clear all cookies at the end of every session, select it in the privacy settings under Tools > Preferences.
Click on Manage cookies to clear specific cookies or cookies from specific domains.

To clear all cookies immediately, go to Delete private data on the Tools menu.

Microsoft Internet Explorer 5 (MacOS X)

Choose Preferences from Explorer menu
Select Receiving Files options
Select Cookies
Select the Cookies to be cleared from the list
Press Delete button

Microsoft Internet Explorer 5 (MacOS 9)

Choose Preferences from Edit menu
Select Receiving Files options
Select Cookies
Select the Cookies to be cleared from the list
Press Delete button

Mozilla

Choose Cookie Manager from the Tools menu.
Choose Manage Stored Cookies.
Remove any cookie from the list, or remove all cookies.

Netscape Navigator 7.x

Choose Cookie Manager from the Tools menu.
Choose Manage Stored Cookies.
Remove any cookie from the list, or remove all cookies.

Netscape Navigator 6.x

Choose Cookie Manager from the Tools menu.
Choose Manage Stored Cookies.
Remove any cookie from the list, or remove all cookies.

Safari 1.0 (MacOS X)

Choose Preferences from Safari menu
Select Security icon
Press Show Cookies button
Select the Cookies to be cleared from the list
Press Delete button

Opera

To clear all cookies at the end of every session, select it in the privacy settings under Opera > Preferences
Click on Manage cookies to clear specific cookies or cookies from specific domains.

To clear all cookies immediately, go to clear private data on the Tools menu.